2030-23T-SM-RPLF : Gas Discharge Tubes (GDTs) / Gas Plasma Arrestors MINI TRIGARD SURFACT MOUNT GDT The Bourns Gas Discharge Tube ( GDT ) for RS-485 Ports is designed to meet industry standards on RS-485 port interfaces and to provide circuit protection in noisy and harsh electrical environments. For exposed lines that may see large and fast surges and where failure is not acceptable, a